91 results on '"Jiajun Dong"'
Search Results
52. Systemic inhibition of PTPN22 augments anticancer immunity
- Author
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Fangluo Chen, Aditya Mohan, Zaw Phyo, Sarah Croessmann, Joshua C. Denny, Devesh Aggarwal, Zhong Yin Zhang, Soren Charmsaz, Jian-Ping Lin, Nicole Gross, James M. Leatherman, Ben Ho Park, Won Jin Ho, Yunpeng Bai, Neeha Zaidi, Mark Yarchoan, Todd D. Armstrong, Elizabeth M. Jaffee, Jiajun Dong, Jing He, Elana J. Fertig, Janey Wang, and Ludmila Danilova
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musculoskeletal diseases ,endocrine system diseases ,medicine.medical_treatment ,T-cell receptor ,Cancer ,General Medicine ,Immunotherapy ,Protein tyrosine phosphatase ,Biology ,medicine.disease ,eye diseases ,PTPN22 ,Cancer immunotherapy ,immune system diseases ,medicine ,Cancer research ,Macrophage ,skin and connective tissue diseases ,CD8 ,Research Article - Abstract
Both epidemiologic and cellular studies in the context of autoimmune diseases have established that protein tyrosine phosphatase nonreceptor type 22 (PTPN22) is a key regulator of T cell receptor (TCR) signaling. However, its mechanism of action in tumors and its translatability as a target for cancer immunotherapy have not been established. Here, we show that a germline variant of PTPN22, rs2476601, portended a lower likelihood of cancer in patients. PTPN22 expression was also associated with markers of immune regulation in multiple cancer types. In mice, lack of PTPN22 augmented antitumor activity with greater infiltration and activation of macrophages, natural killer (NK) cells, and T cells. Notably, we generated a small molecule inhibitor of PTPN22, named L-1, that phenocopied the antitumor effects seen in genotypic PTPN22 knockout. PTPN22 inhibition promoted activation of CD8(+) T cells and macrophage subpopulations toward MHC-II–expressing M1-like phenotypes, both of which were necessary for successful antitumor efficacy. Increased PD-1/PD-L1 axis expression in the setting of PTPN22 inhibition could be further leveraged with PD-1 inhibition to augment antitumor effects. Similarly, cancer patients with the rs2476601 variant responded significantly better to checkpoint inhibitor immunotherapy. Our findings suggest that PTPN22 is a druggable systemic target for cancer immunotherapy.
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- 2021
53. SERS Selective Enhancement on Monolayer MoS
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Huanhuan, Sun, Mingguang, Yao, Shuang, Liu, Yanping, Song, Fangren, Shen, Jiajun, Dong, Zhen, Yao, Bing, Zhao, and Bingbing, Liu
- Abstract
As a newly emerging approach for surface-enhanced Raman spectroscopy (SERS), pressure-induced SERS (PI-SERS) has been attracting increasing interest for its applications in Raman signal enhancement at extreme conditions. However, how to efficiently realize the PI-SERS enhancement and elucidate the corresponding mechanism remain open questions. Herein, we demonstrate the PI-SERS enhancement up to 8.04 GPa using monolayer molybdenum disulfide (ML-MoS
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- 2021
54. Vibrational Properties and Polymerization of Corannulene under Pressure, Probed by Raman and Infrared Spectroscopies
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Mingchao Wang, Ran Liu, Qingjun Zhou, Bingbing Liu, Ying Zhang, Zepeng Li, Jiajun Dong, Bo Liu, Mingrun Du, Tong Wei, and Xigui Yang
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Materials science ,Infrared ,macromolecular substances ,02 engineering and technology ,engineering.material ,010402 general chemistry ,01 natural sciences ,chemistry.chemical_compound ,symbols.namesake ,stomatognathic system ,Physical and Theoretical Chemistry ,Intermolecular force ,Diamond ,021001 nanoscience & nanotechnology ,0104 chemical sciences ,Surfaces, Coatings and Films ,Electronic, Optical and Magnetic Materials ,General Energy ,chemistry ,Polymerization ,Corannulene ,engineering ,symbols ,Physical chemistry ,0210 nano-technology ,Raman spectroscopy - Abstract
Here, we report a high-pressure study on corannulene up to 27.6 GPa using the diamond cell technique assisted by Raman and infrared spectroscopic measurements. The intermolecular interactions betwe...
- Published
- 2019
55. Study on disordered graphitic nanocarbon under pressure and their transformation into polycrystalline nanodiamond
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Jiajun Dong, Kuo Hu, Yan Wang, Mingguang Yao, Shang Yuchen, Zhenhui Kang, Luyao Zhu, Bingbing Liu, and Ran Liu
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Materials science ,Graphene ,General Physics and Astronomy ,Nanoparticle ,02 engineering and technology ,010402 general chemistry ,021001 nanoscience & nanotechnology ,01 natural sciences ,Grain size ,0104 chemical sciences ,law.invention ,Chemical engineering ,law ,High pressure ,Crystallite ,Physical and Theoretical Chemistry ,0210 nano-technology ,Nanodiamond - Abstract
We report the high stability and reversibility of disordered graphitic nanocarbon (DGN) under high pressure. No bonding change can be observed in DGN even up to 52.0 GPa and it fully recovers upon decompression. The high stability and reversibility should be related to its unique highly disordered structure which consists of nanosized wavy graphene layers, making the DGN elastic upon compression. Combined with high temperature, DGN is transformed into polycrystalline nanodiamonds with average grain size smaller than the pristine nanoparticles.
- Published
- 2019
56. Transparent aerogel-like diamond nanofilms from glassy carbon by high pressure and high temperature
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Ran Liu, Hanming Ma, Xiao Dai, Jiajun Dong, Guifu Zou, Mingguang Yao, Bingbing Liu, Luyao Zhu, and Yan Wang
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Morphology (linguistics) ,Materials science ,Mechanical Engineering ,Diamond ,Aerogel ,02 engineering and technology ,General Chemistry ,engineering.material ,Glassy carbon ,010402 general chemistry ,021001 nanoscience & nanotechnology ,Microstructure ,01 natural sciences ,0104 chemical sciences ,Electronic, Optical and Magnetic Materials ,Diffusion process ,High pressure ,Materials Chemistry ,engineering ,Electrical and Electronic Engineering ,Composite material ,0210 nano-technology ,Porosity - Abstract
Aerogel films have been widely used in various fields due to their fantastic properties. Diamond aerogel film is expected to possess the advantages of both film materials and aerogel like materials, but still has not been realized up to now. Here, we provide a feasible way to prepare freestanding, transparent aerogel-like diamond nanofilm (ADF) by treating glassy carbon nanofilm (GCF) at high pressure and high temperature (HPHT). The ADF is constructed by interconnected ultra-small diamond nanograins and possess a porous aerogel-like microstructure, while inherits a film morphology of the parent glassy carbon. The growth of ADF has been discussed in the framework of a melting and diffusion process, in which the low density and low thickness of GCF precursor favor the aerogel formation under HPHT. Further insight into the formation of such unique ADFs has been presented. The aerogel-like diamond nanofilm adds a new member into diamond film family and may expand the applications of this type of porous nanofilm.
- Published
- 2019
57. Research of the Influence of Road Excitation on Human Body Comfort under the Harvester Working Condition
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Chenglong Wang, Shuang Liu, Hongmei Xu, Jiajun Dong, Wei Jiang, and Jie Zhou
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Vibration ,Acceleration ,Range (aeronautics) ,Road surface ,Acoustics ,General Engineering ,Environmental science ,Surface finish ,Combine harvester ,Excitation ,Working condition - Abstract
When the harvester travels in the field, road excitation will cause low-frequency vibration within 3 Hz, which is the most sensitive frequency range of human body. In order to evaluate the influence of road excitation on the comfort feelings of the harvester driver, vibration acceleration data were collected when the combine harvester was travelling at high and low speeds on flat-soft road, flat-solid road, and rough-solid road. The vibration comfort of the harvester was evaluated by root mean square (RMS) of weighted acceleration. The results showed that the speed of harvester, road surface roughness and hardness have great effects on harvester vibration comfort. Soft road has an obvious absorption effect on the vibration at 70 Hz. The increase in the speed of harvester and road surface hardness and roughness elevates the subjective discomfort of the driver. Keywords: Combine harvester, Comfort research, Road excitation, Root mean square of weighted acceleration, Vibration test.
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- 2019
58. Pressure-induced SERS enhancement in a MoS2/Au/R6G system by a two-step charge transfer process
- Author
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Bing Zhao, Luyao Zhu, Ran Liu, Huanhuan Sun, Yanping Song, Peng Li, Mingguang Yao, Jiajun Dong, and Bingbing Liu
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Materials science ,Field (physics) ,Nanoparticle ,Charge (physics) ,02 engineering and technology ,Substrate (electronics) ,010402 general chemistry ,021001 nanoscience & nanotechnology ,01 natural sciences ,0104 chemical sciences ,symbols.namesake ,Adsorption ,Chemical physics ,symbols ,Molecule ,General Materials Science ,Surface plasmon resonance ,0210 nano-technology ,Raman spectroscopy - Abstract
Pressure-induced surface-enhanced Raman spectroscopy (PI-SERS) represents a new frontier in the research field of SERS. However, relatively few studies have focused on PI-SERS due to many difficulties, such as easy aggregation of nanoparticles, and difficulty in understanding the interaction mechanisms between probe molecules and the SERS substrate at high pressure. Here we developed an efficient semiconductor-metal SERS substrate (MoS2/Au) to study PI-SERS. Different from the previously reported monotonous decrease in Raman intensities upon compression, an anomalous Raman enhancement of R6G molecules adsorbed on the MoS2/Au substrate was observed up to 2.39 GPa, at which the degree of charge transfer (ρCT) between the R6G molecules and the MoS2/Au substrate reaches a maximum. By comparison, it is proposed that the decoration of Au on the SERS system could bring about a two-step charge transfer (CT) process, introduce localized surface plasmon resonance (LSPR), and thus favor the PI-SERS enhancement. Moreover, this charge transfer also causes obvious changes in the optical behaviors of R6G molecules upon compression. This brings new insights into the SERS study and also offers new ideas for the development of SERS application in high pressure studies.
- Published
- 2019
59. Propionate ameliorates diabetes-induced neurological dysfunction through regulating the PI3K/Akt/eNOS signaling pathway
- Author
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Qin, Wu, Jiajun, Dong, Xinying, Bai, Yuan, Jiang, Jinjin, Li, Shiqi, Fan, Yahong, Cheng, and Gaofeng, Jiang
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Pharmacology ,Mice ,Phosphatidylinositol 3-Kinases ,Nitric Oxide Synthase Type III ,Animals ,Phosphatidylinositol 3-Kinase ,Propionates ,Nitric Oxide ,Proto-Oncogene Proteins c-akt ,Diabetes Mellitus, Experimental ,Signal Transduction - Abstract
A large body of research has established diabetes-related cognitive deterioration, sometimes known as "diabetic encephalopathy". Current evidence supports that oxidative stress, neuronal apoptosis, and cerebral microcirculation weakness are associated with cognition deficits induced by diabetes. The present study explores the effect of propionate on neurological deficits, cerebral blood flow, and oxidative stress in diabetic mice. Propionate in different doses (37.5, 75 and 150 mg/kg) was orally administrated daily. Here, we show that propionate can markedly improve neurological function, which is correlated with its capabilities of stimulating nitrogen monoxide (NO) production, increasing cerebral microcirculation, suppressing oxidative stress, and reducing neuron loss in the hippocampus. In addition, the results of Western Blotting indicated that the brain-protective function of propionate in streptozocin (STZ)-induced type 1 diabetes mellitus (T1DM) mice is related to phosphoinositide 3-kinase (PI3K)/serine-threonine protein kinase (Akt)/endothelial nitrogen monoxide synthase (eNOS) signaling pathway. In a diabetic mouse model, propionate reduces cerebral microcirculation, hippocampus apoptosis, and neurological impairment. Thus, propionate, now employed as a food preservative, may also help slow diabetes-induced cognitive loss.
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- 2022
60. Quantitative analysis and evaluation of manipulation comfort of tractor gear shifting based on combined methods
- Author
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Liu Haiyue, Wei Jiang, Chenglong Wang, Shuang Liu, Hongmei Xu, Wenjie Zhong, and Jiajun Dong
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Tractor ,business.product_category ,Quantitative analysis (finance) ,Computer science ,Human Factors and Ergonomics ,business ,Industrial and Manufacturing Engineering ,Combined method ,Automotive engineering - Published
- 2018
61. MYCN mediates TFRC-dependent ferroptosis and reveals vulnerabilities in neuroblastoma
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Qing Yang, Yuxiong Lu, Jin-Xin Bei, Liyan Xu, Guobang Li, Yubin Su, Chaoyun Pan, Bo Li, Yi Wu, Xiaoqiong Gu, Yin Ji, Jiajun Dong, Zhaoliang Lu, and Xianzhi Yang
- Subjects
Cell death ,Cancer Research ,Programmed cell death ,Iron ,Immunology ,Transferrin receptor ,GPX4 ,Article ,Cellular and Molecular Neuroscience ,Neuroblastoma ,Downregulation and upregulation ,Antigens, CD ,Cell Line, Tumor ,Receptors, Transferrin ,medicine ,Ferroptosis ,Humans ,neoplasms ,N-Myc Proto-Oncogene Protein ,QH573-671 ,Lipid peroxide ,Chemistry ,HEK 293 cells ,Lipid metabolism ,Cell Biology ,medicine.disease ,Phospholipid Hydroperoxide Glutathione Peroxidase ,Cancer metabolism ,HEK293 Cells ,Cancer research ,Cytology - Abstract
MYCN amplification is tightly associated with the poor prognosis of pediatric neuroblastoma (NB). The regulation of NB cell death by MYCN represents an important aspect, as it directly contributes to tumor progression and therapeutic resistance. However, the relationship between MYCN and cell death remains elusive. Ferroptosis is a newly identified cell death mode featured by lipid peroxide accumulation that can be attenuated by GPX4, yet whether and how MYCN regulates ferroptosis are not fully understood. Here, we report that MYCN-amplified NB cells are sensitive to GPX4-targeting ferroptosis inducers. Mechanically, MYCN expression reprograms the cellular iron metabolism by upregulating the expression of TFRC, which encodes transferrin receptor 1 as a key iron transporter on the cell membrane. Further, the increased iron uptake promotes the accumulation of labile iron pool, leading to enhanced lipid peroxide production. Consistently, TFRC overexpression in NB cells also induces selective sensitivity to GPX4 inhibition and ferroptosis. Moreover, we found that MYCN fails to alter the general lipid metabolism and the amount of cystine imported by System Xc(−) for glutathione synthesis, both of which contribute to ferroptosis in alternative contexts. In conclusion, NB cells harboring MYCN amplification are prone to undergo ferroptosis conferred by TFRC upregulation, suggesting that GPX4-targeting ferroptosis inducers or TFRC agonists can be potential strategies in treating MYCN-amplified NB.
- Published
- 2021
62. Finite element modal analysis and harmonic response analysis of human arm grasping model
- Author
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Shuang Liu, Hongmei Xu, Jiajun Dong, Wei Jiang, and Yujun Shang
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Adult ,Male ,Models, Anatomic ,Rotation ,Human arm ,Computer science ,Modal analysis ,0206 medical engineering ,Finite Element Analysis ,Biomedical Engineering ,Bioengineering ,Computed tomography ,02 engineering and technology ,Models, Biological ,Vibration ,03 medical and health sciences ,0302 clinical medicine ,Harmonic response ,Imaging, Three-Dimensional ,Finger Joint ,Materials Testing ,medicine ,Humans ,Astrophysics::Galaxy Astrophysics ,Ligaments ,medicine.diagnostic_test ,Hand Strength ,business.industry ,Biomechanics ,030229 sport sciences ,General Medicine ,Structural engineering ,020601 biomedical engineering ,Finite element method ,Computer Science Applications ,Human-Computer Interaction ,Dynamic simulation ,Arm ,business - Abstract
Based on CT scan, the finite element models of human arm were constructed. Modal analysis of the arm was performed, and the natural vibration characteristics were evaluated. The dynamic simulation of the vibration transmission process was carried out when grasping the handle, and the vibration response and transmission characteristics were investigated. Resonance was likely to occur in the ranges of 5-10 Hz and 35-40 Hz, which caused fatigue damage to the arm. Vibrations in the ranges should be avoided having direct contact with the handle. The analysis results were found to be consistent with those of modal analysis.
- Published
- 2020
63. Negative Volume Compressibility in Sc
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Ying, Zhang, Mingguang, Yao, Mingrun, Du, Zhen, Yao, Yan, Wang, Jiajun, Dong, Zhenxing, Yang, Bertil, Sundqvist, Éva, Kováts, Sándor, Pekker, and Bingbing, Liu
- Abstract
According to the laws of thermodynamics, materials normally exhibit contraction or expansion along the directions of the applied pressure or tension. Here, we show that a man-made cocrystal of a metallofullerene and highly energetic cubane, with strained sp
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- 2020
64. An Amorphous/Crystalline Incorporated Si/SiO
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Anyu, Su, Jian, Li, Jiajun, Dong, Di, Yang, Gang, Chen, and Yingjin, Wei
- Subjects
Plant Leaves ,Silicon ,Biomass ,Lithium ,Electrodes ,Zea mays - Abstract
The fabrication of silicon (Si) anode materials derived from high silica-containing plants enables effective utilization of subsidiary agricultural products. However, the electrochemical performances of synthesized Si materials still require improvement and thus need further structural design and morphology modifications, which inevitably increase preparation time and economic cost. Here, the conversion of corn leaves into Si anode materials is reported via a simple aluminothermic reduction reaction without other modifications. The obtained Si material inherits the structural characteristics of the natural corn leaf template and has many inherent advantages, such as high porosity, amorphous/crystalline mixture structure, and high-valence SiO
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- 2020
65. Pressure-induced SERS enhancement in a MoS
- Author
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Huanhuan, Sun, Mingguang, Yao, Yanping, Song, Luyao, Zhu, Jiajun, Dong, Ran, Liu, Peng, Li, Bing, Zhao, and Bingbing, Liu
- Abstract
Pressure-induced surface-enhanced Raman spectroscopy (PI-SERS) represents a new frontier in the research field of SERS. However, relatively few studies have focused on PI-SERS due to many difficulties, such as easy aggregation of nanoparticles, and difficulty in understanding the interaction mechanisms between probe molecules and the SERS substrate at high pressure. Here we developed an efficient semiconductor-metal SERS substrate (MoS
- Published
- 2019
66. Decompression-Induced Diamond Formation from Graphite Sheared under Pressure
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Zhen Yao, Luyao Zhu, Rui Li, Bertil Sundqvist, Bingbing Liu, Yan Wang, Mingguang Yao, Jiajun Dong, Ke Yang, Huanhuan Sun, and Kuo Hu
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Materials science ,Concerted reaction ,Nucleation ,General Physics and Astronomy ,Diamond ,engineering.material ,01 natural sciences ,Shear (geology) ,Chemical physics ,Metastability ,0103 physical sciences ,Shear stress ,engineering ,Dynamic range compression ,Graphite ,010306 general physics - Abstract
Graphite is known to transform into diamond under dynamic compression or under combined high pressure and high temperature, either by a concerted mechanism or by a nucleation mechanism. However, these mechanisms fail to explain the recently reported discovery of diamond formation during ambient temperature compression combined with shear stress. Here we report a new transition pathway for graphite to diamond under compression combined with shear, based on results from both theoretical simulations and advanced experiments. In contrast to the known model for thermally activated diamond formation under pressure, the shear-induced diamond formation takes place during the decompression process via structural transitions. At a high pressure with large shear, graphite transforms into ultrastrong $s{p}^{3}$ phases whose structures depend on the degree of shear stress. These metastable $s{p}^{3}$ phases transform into either diamond or graphite upon decompression. Our results explain several recent experimental observations of low-temperature diamond formation. They also emphasize the importance of shear stress for diamond formation, providing new insight into the graphite-diamond transformation mechanism.
- Published
- 2019
67. Direct Conversion of Graphene Aerogel into Low-Density Diamond Aerogel Composed of Ultrasmall Nanocrystals
- Author
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Bingbing Liu, Yan Wang, Kuo Hu, Jiajun Dong, Luyao Zhu, Ran Liu, Chen Gong, and Mingguang Yao
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Materials science ,chemistry.chemical_element ,02 engineering and technology ,engineering.material ,01 natural sciences ,law.invention ,law ,Phase (matter) ,0103 physical sciences ,Graphite ,Physical and Theoretical Chemistry ,010306 general physics ,Graphene ,Diamond ,Aerogel ,021001 nanoscience & nanotechnology ,Surfaces, Coatings and Films ,Electronic, Optical and Magnetic Materials ,General Energy ,Amorphous carbon ,Chemical engineering ,chemistry ,Nanocrystal ,engineering ,0210 nano-technology ,Carbon - Abstract
Diamond aerogel, a special kind of carbon aerogel made by sp3 carbon atoms, has been attracting intensive research interest due to its potential applications since it is first synthesized by the conversion of amorphous carbon. Despite of many expectations in diamond aerogel, the study on its synthesis is still not adequate compared with other carbon aerogel. Here we report the synthesis of diamond aerogel by laser heating graphene aerogel (GA) under high pressure in a diamond anvil cell. The results suggest that the density and microstructure of GA, as well as the heating duration obviously affect the diamond aerogel growth. When heating GA with lower laser power, we also observe a transparent carbon phase in experiment, which transforms into graphite and amorphous carbon upon decompression. These results present new insights into our understanding on the transformation from ultralow density carbon to sp3 carbon under high pressure and high temperature. It is possible to tune the microstructures of diamon...
- Published
- 2018
68. Tuning the band gap and the nitrogen content in carbon nitride materials by high temperature treatment at high pressure
- Author
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Hua Zhang, Kuo Hu, Meng Xianwei, Qiang Tao, Bertil Sundqvist, Qian Lu, Jiajun Dong, Zhenxing Yang, Bing bing Liu, Bo Liu, Mingguang Yao, and Pinwen Zhu
- Subjects
nitrogen stoichiometry ,Raman scattering ,Materials science ,Carbon nitride ,Band gap ,chemistry.chemical_element ,02 engineering and technology ,010402 general chemistry ,01 natural sciences ,chemistry.chemical_compound ,Temperature treatment ,band gap ,XPS ,Energy transformation ,General Materials Science ,General Chemistry ,Condensed Matter Physics ,021001 nanoscience & nanotechnology ,Nitrogen ,X-ray diffraction ,0104 chemical sciences ,high pressure ,chemistry ,Chemical engineering ,High pressure ,Photocatalysis ,0210 nano-technology ,Den kondenserade materiens fysik - Abstract
Carbon nitride (C-N) materials have been attracting great interest because of their extraordinary performance in photocatalysis and energy conversion. However, developing an effective strategy for achieving band-gap engineering of C-N materials to satisfy practical applications remains highly desired. Here we report an efficient way to tune the band gap and control the nitrogen stoichiometry in carbon nitride compounds by using high pressure and high temperature (HPHT) treatment. It is found that treating a g-C3N4 precursor at relatively low temperature (630oC and below) under pressure can efficiently narrow the band gap even down to the red light region (~600 nm), increase the crystallinity, and significantly improve the charge carrier separation efficiency (by two orders of magnitude), almost without changing their stoichiometry. When increasing the treatment temperature under pressure, nitrogen-doped graphene/graphite materials with weak ferromagnetism were obtained. We thus obtained C-N materials with tunable band gaps, ranging from semiconducting to metallic states. XPS measurements show that pyridinic nitrogen is preferentially eliminated under such HPHT conditions while graphitic nitrogen is preserved in the C-N network. Our results thus provide an efficient strategy for tuning the structure and physical properties of C-N materials for applications. Supplementary information available at the journal website.
- Published
- 2018
69. Bioresponsive albumin-conjugated paclitaxel prodrugs for cancer therapy
- Author
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Zhengtao Yang, Jincheng Yang, Jiajun Dong, Wei Wei, Zhonggui He, Qiming Kan, Qingzhi Lv, Ruoshi Zhang, and Youjun Xu
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Male ,medicine.medical_treatment ,Pharmaceutical Science ,Apoptosis ,02 engineering and technology ,Pharmacology ,chemistry.chemical_compound ,paclitaxel ,Drug Delivery Systems ,0302 clinical medicine ,Tumor Microenvironment ,Prodrugs ,Tissue Distribution ,Whole Body Imaging ,Mice, Inbred BALB C ,Chemistry ,Optical Imaging ,Serum Albumin, Bovine ,General Medicine ,Prodrug ,021001 nanoscience & nanotechnology ,Glutathione ,Controlled release ,Absorption, Physiological ,Paclitaxel ,030220 oncology & carcinogenesis ,Injections, Intravenous ,Drug delivery ,Female ,albumin-conjugate ,0210 nano-technology ,Oxidation-Reduction ,Research Article ,Serum Albumin, Human ,ox/re-sensitive release ,03 medical and health sciences ,In vivo ,Cell Line, Tumor ,medicine ,Animals ,Humans ,Chemotherapy ,lcsh:RM1-950 ,Albumin ,Prostatic Neoplasms ,epr effect ,Antineoplastic Agents, Phytogenic ,Xenograft Model Antitumor Assays ,maleimide ,Drug Liberation ,lcsh:Therapeutics. Pharmacology ,Reactive Oxygen Species - Abstract
The efficacy of traditional chemotherapy often suffers from rapid clearance and off-target toxicity. Drug delivery systems and controlled release are applied to improve the therapeutic efficiencies of small-molecule drugs. In this work, two novel oxidative/reductive (Ox/Re) -sensitive and one non-sensitive Paclitaxel (PTX) prodrugs were synthesized with a maleimide group, which rapidly conjugates with albumin in vivo. Albumin serves as a good vehicle to deliver more prodrug to tumors due to the enhanced permeation and retention (EPR) effect. PTX was then released from the prodrugs in glutathione(GSH)/ reactive oxygen species(ROS)-rich tumor microenvironments. This bioresponsive prodrug strategy demonstrates potent chemotherapeutic efficiency in vivo and may be utilized in clinical cancer therapy.
- Published
- 2018
70. Lithium poly-acrylic acid as a fast Li+ transport media and a highly stable aqueous binder for Li3V2(PO4)3 cathode electrodes
- Author
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Jiajun Dong, Qiang Pang, Xin Chen, Yingjin Wei, Dong Zhang, Yingying Zhao, Ruqian Lian, Bingbing Liu, Gang Chen, and Anyu Su
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Aqueous solution ,Materials science ,Renewable Energy, Sustainability and the Environment ,chemistry.chemical_element ,02 engineering and technology ,General Chemistry ,Electrolyte ,Current collector ,010402 general chemistry ,021001 nanoscience & nanotechnology ,Electrochemistry ,01 natural sciences ,Polyvinylidene fluoride ,Cathode ,0104 chemical sciences ,law.invention ,chemistry.chemical_compound ,chemistry ,Chemical engineering ,law ,Electrode ,General Materials Science ,Lithium ,0210 nano-technology - Abstract
Li3V2(PO4)3 (LVP) has been highlighted as a promising cathode material for lithium ion batteries, but it suffers from poor rate capability and rapid capacity decay due to sluggish electrode kinetics and vigorous electrode/electrolyte side reactions at high voltage. In this study, an inexpensive aqueous lithium poly-acrylic acid (LiPAA) binder was developed to deftly solve the shortcomings of the LVP material by tailoring the functional groups in the binder. The good adhesion and cohesion properties of the LiPAA binder ensured a close linkage between the active LVP particles, conductive additives and current collector, which formed a stable and conductive network in the electrode. In addition, the reversible H+/Li+ exchange in LiPAA effectively assisted the transport of Li+ ions at the electrode interface, which allowed the establishment of a Li+ conductive pathway without considerable degradation of the electrolyte. Due to these advantages, the LVP electrode containing the LiPAA binder exhibited significantly improved electrochemical performance compared to the electrode that employed the traditional polyvinylidene fluoride binder. The new electrode configuration showed a large specific capacity of 107 mA h g−1 at 70C rate and a high capacity retention of 91% was obtained after 1400 cycles at 10C rate, showcasing the great potential of this aqueous binder in lithium ion batteries.
- Published
- 2018
71. Targeted Covalent Inhibition of Small CTD Phosphatase 1 to Promote the Degradation of the REST Transcription Factor in Human Cells.
- Author
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Medellin, Brenda, Wanjie Yang, Konduri, Srihari, Jiajun Dong, Irani, Seema, Haoyi Wu, Matthews, Wendy L., Zhong-Yin Zhang, Siegel, Dionico, and Yan Zhang
- Published
- 2022
- Full Text
- View/download PDF
72. Improved Optical Field Distribution and Charge Extraction through an Interlayer of Carbon Nanospheres in Polymer Solar Cells
- Author
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Jiajun Dong, Wenbin Guo, Chunyu Liu, Xinyuan Zhang, Zhiqi Li, Liu Zhang, Xu-Lin Zhang, Yongbing Long, and Liang Shen
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Materials science ,Nanocomposite ,General Chemical Engineering ,Energy conversion efficiency ,chemistry.chemical_element ,Nanotechnology ,02 engineering and technology ,General Chemistry ,010402 general chemistry ,021001 nanoscience & nanotechnology ,01 natural sciences ,Polymer solar cell ,0104 chemical sciences ,chemistry ,Electric field ,Specific surface area ,Electrode ,Materials Chemistry ,0210 nano-technology ,Carbon ,Visible spectrum - Abstract
Nanostructured carbon is a low-cost, economic, and elementally abundant candidate for manufacturing high-conductivity counter electrodes of organic photoelectric devices. Herein, we prepare onion-like carbon nanosphere:silver (OLCNS:Ag) composite electrodes for efficient, inverted-architecture polymer solar cells (PSCs) via a simple, solution-processed approach. The optical electric field distribution from the OLCNS:Ag nanocomposite layer opens up the possibility of additional light harvesting of the entire visible spectrum resulting from synergies between both components. The large effective specific surface area and high conductivity of OLCNS allow significant charge transfer and collection, resulting in a remarkably enhanced power conversion efficiency (PCE) of 9.81% in PTB7:PC71BM PSCs and 6.95% in PCDTBT:PC71BM PSCs, compared with control devices with PCEs of 7.76 and 5.31%, respectively. These consequences indicate that OLCNS:Ag composite electrodes constitute a valid and versatile method for realiz...
- Published
- 2017
73. Surface Passivation of Perovskite Solar Cells Toward Improved Efficiency and Stability
- Author
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Jiajun Dong, Chunyu Liu, Liang Shen, Wenbin Guo, Jiaxin Guo, and Zhiqi Li
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Surface passivation ,Materials science ,Fullerene ,Passivation ,02 engineering and technology ,Charge transport ,010402 general chemistry ,lcsh:Technology ,01 natural sciences ,Article ,Surface defect ,Electrical and Electronic Engineering ,Continuous exposure ,Molecular materials ,Perovskite (structure) ,Perovskite solar cells ,lcsh:T ,business.industry ,021001 nanoscience & nanotechnology ,Electron recombination ,0104 chemical sciences ,Surfaces, Coatings and Films ,Electronic, Optical and Magnetic Materials ,Optoelectronics ,Fill factor ,0210 nano-technology ,business - Abstract
Highlights The TTC layer was efficiently deposited at the grain boundary of the perovskite, which passivated the grain surface and grain boundary, thereby decreasing the interfacial recombination of the perovskite solar cells.The hydrophobic small molecule TTC on the perovskite films forms a water-resistant layer that protects the perovskite from water damage. Electronic supplementary material The online version of this article (10.1007/s40820-019-0282-0) contains supplementary material, which is available to authorized users., The advancement of perovskite solar cells (PVSCs) technology toward commercialized promotion needs high efficiency and optimum stability. By introducing a small molecular material such as tetratetracontane (TTC, CH3(CH2)42CH3) at the fullerene (C60)/perovskite interface of planar p-i-n PVSCs, we significantly reduced the interfacial traps, thereby suppressing electron recombination and facilitating electron extraction. Consequently, an improved efficiency of 20.05% was achieved with a high fill factor of 79.4%, which is one of the best performances for small molecular-modified PVSCs. Moreover, the hydrophobic TTC successfully protects the perovskite film from water damage. As a result, we realized a better long-term stability that maintains 87% of the initial efficiency after continuous exposure for 200 h in air. Electronic supplementary material The online version of this article (10.1007/s40820-019-0282-0) contains supplementary material, which is available to authorized users.
- Published
- 2019
74. Overcoming intrinsic defects of the hole transport layer with optimized carbon nanorods for perovskite solar cells
- Author
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Wenbin Han, Wenbin Guo, Liang Shen, Zhiqi Li, Guanhua Ren, Houxiao Cui, Chunyu Liu, and Jiajun Dong
- Subjects
Materials science ,business.industry ,Energy conversion efficiency ,chemistry.chemical_element ,02 engineering and technology ,010402 general chemistry ,021001 nanoscience & nanotechnology ,01 natural sciences ,Grain size ,0104 chemical sciences ,PEDOT:PSS ,chemistry ,Optoelectronics ,General Materials Science ,Nanorod ,Work function ,0210 nano-technology ,business ,Carbon ,Layer (electronics) ,Perovskite (structure) - Abstract
To overcome the intrinsic chemical-reduction-activity of highly p-doped PEDOT:PSS and improve the open-circuit voltage (Voc) of planar inverted perovskite solar cells, a kind of oxidized carbon nanorods (OCNRs) is developed by a ball-milling/chemical-oxidation method and incorporated into PEDOT:PSS hole transport layer (HTL). The incorporation of OCNRs can increase the work function of the PEDOT:PSS layer, which avoids the energy-level mismatch between the PEDOT:PSS HTL and the HOMO level of the CH3NH3PbI3 perovskite layer, leading to a relatively high Voc of 1.01 V (vs. 0.92 V for the PEDOT:PSS device). Moreover, the introduction of OCNRs into the PEDOT:PSS HTL increases the grain size and uniformity of the perovskite layer, accompanied by the improved charge transport ability. As a result, the fill factor of perovskite solar cells is increased from 75.4% to 81.7%, and the best power conversion efficiency of 19.02% is achieved.
- Published
- 2019
75. Pressure-induced transformations in carbon nano-onions.
- Author
-
Mingguang Yao, Weiwei Zhang, Jiajun Dong, Ran Liu, and Bingbing Liu
- Subjects
CHEMICAL bonds ,CHEMICAL structure ,INTERMOLECULAR forces ,QUANTUM chemistry ,BAND gaps ,ELECTRONIC band structure - Abstract
Carbon nano-onions (CNOs) with an average diameter of 43 nm have been studied under pressure. The interlayer d-spacings of the CNOs are expanded by about 3% compared to those of the larger CNOs with average diameter of 150 nm studied earlier. High pressure study on the G-band of the small CNOs indicates that a bonding change was initiated at 23.4 GPa, which is higher than that of the larger CNOs. The small CNOs were destroyed into amorphous fragments at above 48 GPa with a large applied deviatoric stress, showing a lower high pressure stability compared with the larger CNOs. These features are qualitatively similar to the size effects observed in the compression behavior of some nanocrystalline materials, showing that a reduced cluster size gives similar physical effects in the two classes of materials. The present results for CNOs can be rationalized by the interlayer expansion and the highly turbostratic layer structure of the studied material. The fact that CNOs with different diameters behave differently upon compression is important when selecting materials for applications. [ABSTRACT FROM AUTHOR]
- Published
- 2016
- Full Text
- View/download PDF
76. An Amorphous/Crystalline Incorporated Si/SiO x Anode Material Derived from Biomass Corn Leaves for Lithium‐Ion Batteries
- Author
-
Di Yang, Yingjin Wei, Jian Li, Jiajun Dong, Anyu Su, and Gang Chen
- Subjects
Fabrication ,Materials science ,Silicon ,chemistry.chemical_element ,02 engineering and technology ,General Chemistry ,010402 general chemistry ,021001 nanoscience & nanotechnology ,Electrochemistry ,01 natural sciences ,0104 chemical sciences ,Anode ,Amorphous solid ,Biomaterials ,chemistry ,Chemical engineering ,General Materials Science ,Lithium ,0210 nano-technology ,Porosity ,Current density ,Biotechnology - Abstract
The fabrication of silicon (Si) anode materials derived from high silica-containing plants enables effective utilization of subsidiary agricultural products. However, the electrochemical performances of synthesized Si materials still require improvement and thus need further structural design and morphology modifications, which inevitably increase preparation time and economic cost. Here, the conversion of corn leaves into Si anode materials is reported via a simple aluminothermic reduction reaction without other modifications. The obtained Si material inherits the structural characteristics of the natural corn leaf template and has many inherent advantages, such as high porosity, amorphous/crystalline mixture structure, and high-valence SiOx residuals, which significantly enhance the material's structural stability and electrode adhesive strength, resulting in superior electrochemical performances. Rate capability tests show that the material delivers a high capacity of 1200 mA h g-1 at 8 A g-1 current density. After 300 cycles at 0.5 A g-1 , the material maintains a high specific capacity of 2100 mA h g-1 , with nearly 100% capacity retention during long-term cycling. This study provides an economical route for the industrial production of Si anode materials for Lithium-Ion batteries.
- Published
- 2020
77. [A novel pattern for predicting the quality of Chinese herba preparation intelligently by high performance liquid chromatographic formula fingerprints]
- Author
-
Jiajun Dong, Wanyang Sun, Guoxiang Sun, Yujing Zhang, Dandan Gong, and Jing Zhang
- Subjects
0301 basic medicine ,Quality Control ,TCM Preparation ,Chromatography ,Chemistry ,General Chemical Engineering ,010401 analytical chemistry ,Organic Chemistry ,01 natural sciences ,Biochemistry ,High-performance liquid chromatography ,0104 chemical sciences ,Analytical Chemistry ,03 medical and health sciences ,030104 developmental biology ,Chromatography detector ,Fingerprint ,Scutellariae radix ,Electrochemistry ,Radix ,Medicine, Chinese Traditional ,Chromatography, High Pressure Liquid ,Rhizome ,Drugs, Chinese Herbal ,Tablets - Abstract
In order to build the fusion models, the high performance liquid chromatographic (HPLC) fingerprints of scutellariae radix (SR), rhei radix et rhizoma (RRR), coptidis rhizoma (CR) and their synthesizing fingerprints were developed in this study. After exploring the consistency between the fingerprints of compound synthesizing fingerprints (CSF) and the sample, the quality of traditional Chinese medicine preparation was predicted intelligently using CSF. HPLC coupled with diode array detector was used to obtain chromatograms of SR, RRR, CR and Yi Qing Tablet (YQT) samples at 268 nm. Meanwhile, the quality of CSF and the 15 batches of YQT samples was evaluated by systematically quantified fingerprint method (SQFM) qualitatively and quantitatively. The chromatograms showed that CSF covered the main fingerprints' information of each herb and the 55 common peaks of CSF covered the main information of the 50 common peaks in YQT sample. The evaluation results showed that among the 15 batches of YQT samples, only YQT-S01 was grade 5 and the others were all above grade 3. Most of the CSFs were grade 2 or grade 1 except CSF-2 which was grade 6. The fingerprints of Chinese herba preparation could be replaced by CSF to achieve a novel pattern for predicting the quality of TCM preparation intelligently by studying the relationship between the standard fingerprints and the CSF, and simultaneously developing first-class evaluation software.
- Published
- 2017
78. Remarkable cycle-activated capacity increasing in onion-like carbon nanospheres as lithium battery anode material
- Author
-
Dong Zhang, Mingguang Yao, Huafang Zhang, Ran Liu, Jiajun Dong, Bingbing Liu, Weiwei Zhang, and Tong Zhang
- Subjects
Materials science ,Mechanical Engineering ,chemistry.chemical_element ,Bioengineering ,Nanotechnology ,02 engineering and technology ,General Chemistry ,010402 general chemistry ,021001 nanoscience & nanotechnology ,Electrochemistry ,Combustion ,01 natural sciences ,Lithium battery ,0104 chemical sciences ,Anode ,Ion ,Chemical engineering ,chemistry ,Mechanics of Materials ,General Materials Science ,Lithium ,Graphite ,Electrical and Electronic Engineering ,0210 nano-technology ,Carbon - Abstract
Onion-like carbon nanospheres (OCNSs) with an average diameter of 43 nm were produced on a large scale via a combustion method and examined as an anode material for lithium ion batteries. The OCNSs exhibit a remarkable electrochemical cycling behavior and a capacity much higher than that of graphite. The capacity increases significantly with increasing charge-discharge cycles and reaches a value of 178% of the initial value (from 586 mA h g-1to 1045 mA h g-1) after 200 cycles. Further investigation provides unambiguous experimental evidence that such a remarkable capacity increase is related to the stable onion-like structure of the OCNSs and to the existence of large numbers of disordered/short graphitic fragments, which gradually provide more active sites for Li ion storage. The unique electrochemical performance of OCNSs provides a new way to design a high-performance anode material for rechargeable batteries.
- Published
- 2016
79. Graphdiyne under pressure: A Raman study
- Author
-
Jiajun Dong, Huibiao Liu, Mingguang Yao, Yan Wang, Yanhuan Chen, Ran Liu, Bingbing Liu, Xigui Yang, Yuliang Li, and Mingrun Du
- Subjects
Materials science ,Physics and Astronomy (miscellaneous) ,Graphene ,02 engineering and technology ,010402 general chemistry ,021001 nanoscience & nanotechnology ,01 natural sciences ,Molecular physics ,Pressure coefficient ,0104 chemical sciences ,law.invention ,Vibration ,Graphyne ,symbols.namesake ,law ,High pressure ,symbols ,Anomaly (physics) ,0210 nano-technology ,Raman spectroscopy - Abstract
High pressure Raman spectra of graphdiyne (GDY) have been studied up to 34.63 GPa. We found that sp-hybridized carbons in GDY are highly active and start to undergo a bonding change at around 5.2 GPa. Such a bonding change affects the C-C stretching vibration of sp2 hexagon rings in GDY, leading to an anomaly in the corresponding G-band pressure coefficient. A three-dimensional sp2 structure is proposed to form via pressure-induced interlayer cross-linking of sp carbons in GDY and is stable up to at least 34.63 GPa. Our study presents an important example in the study of graphyne family under pressure.
- Published
- 2018
80. Ordered Amorphous Carbon: New Ordered Structure of Amorphous Carbon Clusters Induced by Fullerene-Cubane Reactions (Adv. Mater. 22/2018)
- Author
-
Mingrun Du, Bertil Sundqvist, Qing Dong, Bo Liu, Peng Ge, Mingguang Yao, Ran Liu, Bingbing Liu, Éva Kováts, Tian Cui, Jiajun Dong, Sándor Pekker, and Shuanglong Chen
- Subjects
chemistry.chemical_compound ,Crystallography ,Materials science ,Fullerene ,Amorphous carbon ,chemistry ,Mechanics of Materials ,Cubane ,Mechanical Engineering ,General Materials Science - Published
- 2018
81. New Ordered Structure of Amorphous Carbon Clusters Induced by Fullerene-Cubane Reactions
- Author
-
Bingbing Liu, Jiajun Dong, Sándor Pekker, Peng Ge, Bertil Sundqvist, Mingrun Du, Éva Kováts, Shuanglong Chen, Qing Dong, Mingguang Yao, Ran Liu, Bo Liu, and Tian Cui
- Subjects
Raman scattering ,Materials science ,Fullerene ,Crystalline materials ,Structure (category theory) ,02 engineering and technology ,01 natural sciences ,chemistry.chemical_compound ,rotor–stator compounds ,0103 physical sciences ,high pressures ,General Materials Science ,010306 general physics ,ordered amorphous carbon clusters ,Mechanical Engineering ,fullerenes ,Condensed Matter Physics ,021001 nanoscience & nanotechnology ,X-ray diffraction ,Amorphous solid ,crystalline structure ,chemistry ,Amorphous carbon ,Mechanics of Materials ,Cubane ,Chemical physics ,cubanes ,Raman spectroscopy ,0210 nano-technology ,Den kondenserade materiens fysik - Abstract
As a new category of solids, crystalline materials constructed with amorphous building blocks expand the structure categorization of solids, for which designing such new structures and understanding the corresponding formation mechanisms are fundamentally important. Unlike previous reports, new amorphous carbon clusters constructed ordered carbon phases are found here by compressing C8H8/C60 cocrystals, in which the highly energetic cubane (C8H8) exhibits unusual roles as to the structure formation and transformations under pressure. The significant role of C8H8 is to stabilize the boundary interactions of the highly compressed or collapsed C60 clusters which preserves their long‐range ordered arrangement up to 45 GPa. With increasing time at high pressure, the gradual random bonding between C8H8 and carbon clusters, due to “energy release” of highly compressed cubane, leads to the loss of the ability of C8H8 to stabilize the carbon cluster arrangement. Thus a transition from short‐range disorder to long‐range disorder (amorphization) occurs in the formed material. The spontaneous bonding reconstruction most likely results in a 3D network in the material, which can create ring cracks on diamond anvils.
- Published
- 2018
82. The substituent effects on the biphenyl H⋯H bonding interactions subjected to torsion
- Author
-
Jiajun, Dong, primary, Xu, Yuning, additional, Xu, Tianlv, additional, Momen, Roya, additional, Kirk, Steven R., additional, and Jenkins, Samantha, additional
- Published
- 2016
- Full Text
- View/download PDF
83. A QTAIM and stress tensor perspective of large-amplitude motions of the tetrasulfur tetranitride S4N4molecular graph
- Author
-
Xu, Yuning, primary, Xu, Tianlv, additional, Jiajun, Dong, additional, Kirk, Steven R., additional, and Jenkins, Samantha, additional
- Published
- 2016
- Full Text
- View/download PDF
84. Pressure-induced transformations in carbon nano-onions
- Author
-
Jiajun Dong, Bingbing Liu, Ran Liu, Mingguang Yao, and Weiwei Zhang
- Subjects
Materials science ,General Physics and Astronomy ,chemistry.chemical_element ,Nanotechnology ,02 engineering and technology ,010402 general chemistry ,021001 nanoscience & nanotechnology ,Compression (physics) ,01 natural sciences ,Nanocrystalline material ,0104 chemical sciences ,Amorphous solid ,Stress (mechanics) ,chemistry ,High pressure ,Nano ,Cluster size ,Composite material ,0210 nano-technology ,Carbon - Abstract
Carbon nano-onions (CNOs) with an average diameter of 43 nm have been studied under pressure. The interlayer d-spacings of the CNOs are expanded by about 3% compared to those of the larger CNOs with average diameter of 150 nm studied earlier. High pressure study on the G-band of the small CNOs indicates that a bonding change was initiated at 23.4 GPa, which is higher than that of the larger CNOs. The small CNOs were destroyed into amorphous fragments at above 48 GPa with a large applied deviatoric stress, showing a lower high pressure stability compared with the larger CNOs. These features are qualitatively similar to the size effects observed in the compression behavior of some nanocrystalline materials, showing that a reduced cluster size gives similar physical effects in the two classes of materials. The present results for CNOs can be rationalized by the interlayer expansion and the highly turbostratic layer structure of the studied material. The fact that CNOs with different diameters behave differently upon compression is important when selecting materials for applications.
- Published
- 2016
85. Biphenyl: A stress tensor and vector-based perspective explored within the quantum theory of atoms in molecules
- Author
-
Jenkins, Samantha, primary, Maza, Julio R., additional, Xu, Tianlv, additional, Jiajun, Dong, additional, and Kirk, Steven R., additional
- Published
- 2015
- Full Text
- View/download PDF
86. Improved Optical Field Distribution and Charge Extraction through an Interlayer of Carbon Nanospheres in Polymer Solar Cells.
- Author
-
Zhiqi Li, Jiajun Dong, Chunyu Liu, Xulin Zhang, Xinyuan Zhang, Liang Shen, Wenbin Guo, Liu Zhang, and Yongbing Long
- Subjects
- *
OPTICAL analyzers , *CARBON , *SOLAR cells , *POLYMERS , *PHOTOELECTRIC devices - Abstract
Nanostructured carbon is a low-cost, economic, and elementally abundant candidate for manufacturing high-conductivity counter electrodes of organic photoelectric devices. Herein, we prepare onion-like carbon nanosphere:silver (OLCNS:Ag) composite electrodes for efficient, inverted-architecture polymer solar cells (PSCs) via a simple, solution-processed approach. The optical electric field distribution from the OLCNS:Ag nanocomposite layer opens up the possibility of additional light harvesting of the entire visible spectrum resulting from synergies between both components. The large effective specific surface area and high conductivity of OLCNS allow significant charge transfer and collection, resulting in a remarkably enhanced power conversion efficiency (PCE) of 9.81% in PTB7:PC71BM PSCs and 6.95% in PCDTBT:PC71BM PSCs, compared with control devices with PCEs of 7.76 and 5.31%, respectively. These consequences indicate that OLCNS:Ag composite electrodes constitute a valid and versatile method for realizing high-performance organic photovoltaic devices. [ABSTRACT FROM AUTHOR]
- Published
- 2017
- Full Text
- View/download PDF
87. A QTAIM and stress tensor perspective of large-amplitude motions of the tetrasulfur tetranitride S4N4 molecular graph.
- Author
-
Xu, Yuning, Xu, Tianlv, Jiajun, Dong, Kirk, Steven R., and Jenkins, Samantha
- Subjects
MOLECULAR graphs ,INTRAMOLECULAR catalysis ,NITRIDES ,SULFUR ,POLARIZABILITY (Electricity) ,CRITICAL point (Thermodynamics) - Abstract
The nature of the bonding interactions including the intramolecular SS interactions in tetrasulfur tetranitride, S
4 N4 are probed by performing very large amplitude vibrations of all of the 18 normal modes of vibration. The QTAIM and stress tensor point properties are -then investigated and found to be highly dependent on the mode of vibration. A considerable degree of metallicity ξ( rb ) is found for the SS and SN bonding interactions. A unique bonding feature is found for a small amplitude vibration of the most anharmonic mode of this investigation, mode 2, where the SS bond critical point (BCP) transforms from a closed-shell SS BCP to a shared-shell SS BCP. We find 17 new unique QTAIM topologies for the molecular graphs corresponding to the 18 modes of vibration along with seven 'missing' topologies that are mapped onto a spanning 2-D Quantum topology Phase Diagram (QTPD). In addition, eleven unique topologies existing on 3-D QTPDs are found due to the presence of non-nuclear attractors (NNAs). We use the stress tensor eigenvalues to explain the invariance of the numbers and types of QTAIM critical points. The applicability of both the stiffness S and stress tensor stiffness Sσ are also explored. Two new bond measures are introduced, a polarizability P and the stress tensor polarizability Pσ which are derived from the stiffness S and stress tensor stiffness Sσ , respectively. © 2016 Wiley Periodicals, Inc. [ABSTRACT FROM AUTHOR]- Published
- 2016
- Full Text
- View/download PDF
88. Off-target autophagy inhibition by SHP2 allosteric inhibitors contributes to their antitumor activity in RAS-driven cancers.
- Author
-
Yiming Miao, Yunpeng Bai, Jinmin Miao, Allison A. Murray, Jianping Lin, Jiajun Dong, Zihan Qu, Ruo-Yu Zhang, Quyen D. Nguyen, Shaomeng Wang, Jingmei Yu, Frederick Nguele Meke, and Zhong-Yin Zhang
- Subjects
- *
ANTINEOPLASTIC agents , *AUTOPHAGY , *PROTEIN-tyrosine kinases , *MITOGEN-activated protein kinases , *PANCREATIC cancer - Abstract
Aberrant activation of RAS/MAPK signaling is common in cancer, and efforts to inhibit pathway components have yielded drugs with promising clinical activities. Unfortunately, treatment-provoked adaptive resistance mechanisms inevitably develop, limiting their therapeutic potential. As a central node essential for receptor tyrosine kinase--mediated RAS activation, SHP2 has emerged as an attractive cancer target. Consequently, many SHP2 allosteric inhibitors are now in clinical testing. Here we discovered a previously unrecognized off-target effect associated with SHP2 allosteric inhibitors. We found that these inhibitors accumulate in the lysosome and block autophagic flux in an SHP2-independent manner. We showed that off-target autophagy inhibition by SHP2 allosteric inhibitors contributes to their antitumor activity. We also demonstrated that SHP2 allosteric inhibitors harboring this off-target activity not only suppress oncogenic RAS signaling but also overcome drug resistance such as MAPK rebound and protective autophagy in response to RAS/MAPK pathway blockage. Finally, we exemplified a therapeutic framework that harnesses both the on- and off-target activities of SHP2 allosteric inhibitors for improved treatment of mutant RAS--driven and drug-resistant malignancies such as pancreatic and colorectal cancers. [ABSTRACT FROM AUTHOR]
- Published
- 2024
- Full Text
- View/download PDF
89. Decompression-Induced Diamond Formation from Graphite Sheared under Pressure.
- Author
-
Jiajun Dong, Zhen Yao, Mingguang Yao, Rui Li, Kuo Hu, Luyao Zhu, Yan Wang, Huanhuan Sun, Sundqvist, Bertil, Ke Yang, and Bingbing Liu
- Subjects
- *
DIAMONDS , *SHEARING force , *GRAPHITE , *PRESSURE , *HIGH temperatures , *DIAMOND crystals - Abstract
Graphite is known to transform into diamond under dynamic compression or under combined high pressure and high temperature, either by a concerted mechanism or by a nucleation mechanism. However, these mechanisms fail to explain the recently reported discovery of diamond formation during ambient temperature compression combined with shear stress. Here we report a new transition pathway for graphite to diamond under compression combined with shear, based on results from both theoretical simulations and advanced experiments. In contrast to the known model for thermally activated diamond formation under pressure, the shear-induced diamond formation takes place during the decompression process via structural transitions. At a high pressure with large shear, graphite transforms into ultrastrong sp³ phases whose structures depend on the degree of shear stress. These metastable sp³ phases transform into either diamond or graphite upon decompression. Our results explain several recent experimental observations of low-temperature diamond formation. They also emphasize the importance of shear stress for diamond formation, providing new insight into the graphite-diamond transformation mechanism. [ABSTRACT FROM AUTHOR]
- Published
- 2020
- Full Text
- View/download PDF
90. Remarkable cycle-activated capacity increasing in onion-like carbon nanospheres as lithium battery anode material.
- Author
-
Jiajun Dong, Tong Zhang, Dong Zhang, Weiwei Zhang, Huafang Zhang, Ran Liu, Mingguang Yao, and Bingbing Liu
- Subjects
- *
CARBON electrodes , *LITHIUM-ion batteries - Abstract
Onion-like carbon nanospheres (OCNSs) with an average diameter of 43 nm were produced on a large scale via a combustion method and examined as an anode material for lithium ion batteries. The OCNSs exhibit a remarkable electrochemical cycling behavior and a capacity much higher than that of graphite. The capacity increases significantly with increasing charge–discharge cycles and reaches a value of 178% of the initial value (from 586 mA h g−1to 1045 mA h g−1) after 200 cycles. Further investigation provides unambiguous experimental evidence that such a remarkable capacity increase is related to the stable onion-like structure of the OCNSs and to the existence of large numbers of disordered/short graphitic fragments, which gradually provide more active sites for Li ion storage. The unique electrochemical performance of OCNSs provides a new way to design a high-performance anode material for rechargeable batteries. [ABSTRACT FROM AUTHOR]
- Published
- 2017
- Full Text
- View/download PDF
91. Systemic inhibition of PTPN22 augments anticancer immunity.
- Author
-
Won Jin Ho, Croessmann, Sarah, Jianping Lin, Phyo, Zaw H., Charmsaz, Soren, Danilova, Ludmila, Mohan, Aditya A., Gross, Nicole E., Fangluo Chen, Jiajun Dong, Aggarwal, Devesh, Yunpeng Bai, Janey Wang, Jing He, Leatherman, James M., Yarchoan, Mark, Armstrong, Todd D., Zaidi, Neeha, Fertig, Elana J., and Denny, Joshua C.
- Subjects
- *
PROTEIN-tyrosine phosphatase , *T cell receptors , *PHOSPHOPROTEIN phosphatases , *IMMUNITY , *IMMUNOTHERAPY , *KINASES - Abstract
Both epidemiologic and cellular studies in the context of autoimmune diseases have established that protein tyrosine phosphatase non-receptor type 22 (PTPN22) is a key regulator of T cell receptor (TCR) signaling. However, its mechanism of action in tumors and its translatability as a target for cancer immunotherapy have not been established. Here we show that a germline variant of PTPN22, rs2476601, portended a lower likelihood of cancer in patients. PTPN22 expression was also associated with markers of immune regulation in multiple cancer types. In mice, lack of PTPN22 augmented antitumor activity with greater infiltration and activation of macrophages, natural killer (NK) cells, and T cells. Notably, we generated a novel small molecule inhibitor of PTPN22, named L-1, that phenocopied the antitumor effects seen in genotypic PTPN22 knockout. PTPN22 inhibition promoted activation of CD8+ T cells and macrophage subpopulations toward MHC-II expressing M1-like phenotypes, both of which were necessary for successful antitumor efficacy. Increased PD1-PDL1 axis in the setting of PTPN22 inhibition could be further leveraged with PD1 inhibition to augment antitumor effects. Similarly, cancer patients with the rs2476601 variant responded significantly better to checkpoint inhibitor immunotherapy. Our findings suggest that PTPN22 is a druggable systemic target for cancer immunotherapy. [ABSTRACT FROM AUTHOR]
- Published
- 2021
- Full Text
- View/download PDF
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